=IF(AND(MID(ROW(A1000:A2499),1,1)=MID((ROW(A1000:A2499)*4),4,1),MID(ROW(A1000:A2499),2,1)=MID((ROW(A1000:A2499)*4),3,1),MID(ROW(A1000:A2499),3,1)=MID((ROW(A1000:A2499)*4),2,1),MID(ROW(A1000:A2499),4,1)=MID((ROW(A1000:A2499)*4),1,1)),ROW(A1000:A2499),"") |